I've got two sets of Omega speakers (Super 3xrs and Desktop 3) using the new RS5 drivers. Both have similar sounds with the XRS obviously going lower and sounding bigger and a little more natural.
To summarize their sound, I'd say that their strengths are speed, detail, imaging and soundstaging. I think they really sound less like box speakers and more like panel speakers.
For me, the real beauty of the speakers is their ability to be used with low watt single ended tube amps. They really do lose some of their magic when you go to solid state and I have noticed that they sometimes don't seem to sound as good with Class D amps which seem to have too high a damping factor to allow the bass to breathe.
Their weaknesses are low bass extension, hard to handle complex music if you like to blast it and I suppose you could argue...and this is very slight...that they do lose just a tiny bit of sparkle in the highs. You may or may not hear this and even if you do, you won't notice it on most types of music.
I've had quite a few similar priced speakers go through my hands recently including Kef LS50's, Silverline Minuets and Harbeth P3ESR's. In my rooms, I really do prefer the Omegas but depending on how you listen to music and what equipment you use will determine what kind of fit they are for you.